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RADIUS - Unknown user name keeps attempting to authenticate

A user reported that the wifi would disconnect randomly.
Checking the server logs, I see a strange username continuously trying to connect: domain\ABC-x-xx-xx-xx-xx-xx-xx.
It started earlier this week according to the logs.
The SID shows S-1-0-0 which only means unknown from what I can tell so not too helpful.

I'm guessing since this continuously trying to authenticate it could be causing the disconnect problems with other users.

Any idea what this could be? Could it be an attack attempt?
Windows Server 2008Windows NetworkingWireless NetworkingNetwork Security

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8/22/2022 - Mon